July 30, 2007Signals of Supercritical String Theory at the LHC1 T. Kamon B. Dutta, A. Gurrola, T. Kamon, A. Krislock, D. Nanopoulos (Texas A&M University) A.B. Lahanas (University of Athens) N.E. Mavromatos (King's College London, University of London) July 30, The 15th International Conference on Supersymmetry and the Unification of Fundamental Interactions Karlsruhe, Germany July 26 - August 1, 2007

July 30, 2007Signals of Supercritical String Theory at the LHC2Prologue July 30, 2007Signals of Supercritical String Theory at the LHC2Outline Supersymmetric Access to Cosmology at the LHC Dark Matter Connection Stau-Neutralino Co-annihilation   CDM Dark Energy Connection Supercritical String Cosmology (SSC)   CDM(SSC) Key Signals at the LHC Co-annihilation region vs. SSC Mass? Summary

July 30, 2007Signals of Supercritical String Theory at the LHC3 Thinking of Cosmological Connection July 30, 2007Signals of Supercritical String Theory at the LHC3

July 30, 2007Signals of Supercritical String Theory at the LHC4 + Use mSUGRA as a benchmark model + …. Anatomy of  CDM Co-annihilation Process Griest, Seckel ’91

July 30, 2007Signals of Supercritical String Theory at the LHC5 Dark Matter Allowed Region July 30, 2007Signals of Supercritical String Theory at the LHC5 Co-annihilation Region

July 30, 2007Signals of Supercritical String Theory at the LHC6 (LCC3 Point) m 1/2 = 360, m 0 = 215, tan  = 40, m top = 175 mSUGRA Case Study at tan  = % 97%

July 30, 2007Signals of Supercritical String Theory at the LHC7July 30, 2007Signals of Supercritical String Theory at the LHC7 Signal in Co-annihilation Region B ~97% p T  > 20 GeV is essential!

July 30, 2007Signals of Supercritical String Theory at the LHC8Prologue However, there is a another story … July 30, 2007Signals of Supercritical String Theory at the LHC8

July 30, 2007Signals of Supercritical String Theory at the LHC9July 30, 2007Signals of Supercritical String Theory at the LHC9 LMD Scenario Critical term Non-critical term

July 30, 2007Signals of Supercritical String Theory at the LHC10 Translating to Particle Physics July 30, 2007Signals of Supercritical String Theory at the LHC10 hep-ph/

July 30, 2007Signals of Supercritical String Theory at the LHC11 SSC Case Study at tan  = 40 hep-ph/ Let’s look into signals in the region

July 30, 2007Signals of Supercritical String Theory at the LHC12 100% 97% (Arnowitt-Dutta-Kamon Ref. Point) m 1/2 =360, m 0 =215, tan  =40, m top =175 (LMN Ref. Point) m 1/2 =400, m 0 =471, tan  =40, m top = % Co-annihilation region Supercritical String

July 30, 2007Signals of Supercritical String Theory at the LHC13  2 0 DecayBranching Ratios  2 0 Decay Branching Ratios Identify and classify  2 0 decays

July 30, 2007Signals of Supercritical String Theory at the LHC14 Key Reactions at the LHC July 30, 2007Signals of Supercritical String Theory at the LHC14 Check M ( ℓℓj ) and M(bbj) Co-annihilation region Z (or h) Supercritical String

July 30, 2007Signals of Supercritical String Theory at the LHC15 (LMN Ref. Point) m 1/2 =400, m 0 =471, tan  =40, m top = % M(u+Z) [GeV] m 1/2 [GeV] Repeating for  2 0 decay to Higgs MC Truth

July 30, 2007Signals of Supercritical String Theory at the LHC16 OS ee,  Low mass ( M 2 ) histogram High mass ( M 1 ) histogram E T miss + 2j + 2  Analysis Path Cuts to reduce the SM backgrounds (W+jets, …) E T miss > 200 GeV, N(jet) > 2 with E T > 100 GeV E T miss + E T j1 + E T j2 > 600 GeV; N(lepton) > 2 with P T > 20 GeV Low OSSF  OSOF High OSSF  OSOF Low OSOF High OSOF Low OSSF High OSSF OS e  Low mass ( M 2 ) histogram High mass ( M 1 ) histogram CATEGORIZE opposite sign (OS) dileptons

July 30, 2007Signals of Supercritical String Theory at the LHC17 Anatomy : Mass Distributions m 1/2 =400, m 0 =471, tan  =40 78 fb  1 ~800 GeV e.g., M 1 ( ℓℓ j) [GeV] M 2 ( ℓℓ j) [GeV] Mass determination & higgs channel … Work in progress Mass determination & higgs channel … Work in progress

July 30, 2007Signals of Supercritical String Theory at the LHC18Summary July 30, 2007Signals of Supercritical String Theory at the LHC18 Cosmology … Dark Matter and Dark Energy Supercritical-String-Cosmology (SSC) Scalar Field Dark Energy … Smoothly evolving DE for 10 B years Translating to Particle Physics :  CDM(SSC) ~  CDM /10 Implication at the LHC SUSY masses will be heavier than those in co-annihilation region Simultaneous searches for  2 0 decays to h and Z Measurement of  CDM … Work in progress

July 30, 2007Signals of Supercritical String Theory at the LHC19 Backups